andrea, that a 4.9 to 5.1 artificial earthquake had been detected in north korea. quickly, we knew it was a nuclear test. that's on the radar for the president. >> it's on the radar front and center for him, because, first of all, it was much bigger than previous tests. it was the first under this new, young, korean leader, kim jong un, and potentially, they claim at least, set off by a miniaturized device, which could indicate they have made big progress on getting a small weapon on top of a missile. they just did a rocket test in december. and the problem, the threat would be are they advancing to the point where they could potentially reach the continental united states with perhaps a lucky shot? >> all right, andrea mitchell, thanks. and we are going to somehow find room for chuck todd tonight, but we will scrunch together. we will see all of you later on. and stay with us here on nbc, of course. full coverage of the state of the union address beginning 9 eastern here on this nbc station.